Bath tub for 40*40?

Question:right now i have a stand up shower and don;t havbe much space./ but i have a 6 month old son and want a bathtub /. any ideas?

Answers:
Do you have a laundry sink, cos quite seriously, if its big enough you could wash him in that - my mum used to put me in her laundry trough, she said it saved her back too because she didn't have to bend over into a bath.
I work in a plumbing store, and the smallest 'bath' we sell is 900mm x 900mm, or 1200mm x 800mm. Depends if you want to remodel your bathroom, or if you are looking for something to use short term. Look at places like storage stores and hardware supply stores for small pool or somethnig you could fit inside your shower to use.
Don't know if I've been much help, but be prepared to think outside the square and good luck!